Published 12:00 am, Friday, March 22, 2013

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FILE - In this Dec. 14, 2012 file photo, Alissa Parker, left, and her husband, Robbie Parker, leave the firehouse staging after receiving word that their six-year-old daughter Emilie was one of the 20 children killed in the Sandy Hook School shooting in Newtown, Conn. Alissa Parker told "CBS This Morning" in an interview that aired Thursday, March 21, 2013, that she wanted to meet with Adam Lanza's father, Peter Lanza, to tell him "something" she needed to get out of her system. It's not clear what that something was. CBS planned to show the rest of the interview with Alissa and Robbie Parker on Friday morning revealing more details about their meeting with Peter Lanza. (AP Photo/Jessica Hill) less

FILE - In this Dec. 14, 2012 file photo, Alissa Parker, left, and her husband, Robbie Parker, leave the firehouse staging after receiving word that their six-year-old daughter Emilie was one of the 20 children ... more

Alissa Parker, mother of one of the murdered children at the Sandy Hook Elementary School, told CBS This Morning that the killer's mother "has a lot of accountability" in the tragedy.

"I don't understand what she saw and what she didn't, and looking from the outside in it's hard to not think there were things she could have done. But I'm not in her place. I don't understand their dynamics and their situation, and so I'm never going to understand that," Parker told Norah O'Donnell in an interview that was broadcast Friday morning.

Asked specifically however, if Nancy Lanza, mother of the killer, Adam Lanza, was accountable for the slayings, Parker said without hesitation, "Oh, I think she has a lot of accountability."

Lanza killed 20 first-graders, including Emilie Parker, daughter of Alissa and Robbie Parker, and six educators at the school on the morning of Dec. 14.

The Parkers met with Peter Lanza, father of Adam Lanza, a little over a month after the slayings.

They did not reveal the specifics of that conversation in the interview. Peter Lanza was divorced from Nancy Lanza, who lived with Adam in Newtown.

Adam Lanza, 20, killed his mother in her bed before he took her car and weapons and drove to the school. He killed himself as police closed in on him minutes after the shootings.

Alissa Parker said ultimately assigning blame for the killings, "is not my burden to carry."

She said neither she nor her husband hold Peter Lanza "solely responsible. ... I feel like he has made mistakes. I don't feel like he gets the pass, but I don't feel like he should be responsible for what happened that day. ... Were there missteps in the raising of his son? Possibly."

Within hours of the shooting, Robbie Parker spoke out publically about the tragedy and said he hoped it was not something that defined them, but "instead something that inspires us to be better, more compassionate, humble people."

Alissa Parker said they wanted to meet Adam's father because he held the key to so much information about his son's medical history and "things he had gone through" since both Nancy and Adam were dead. "Without his cooperation, it would go nowhere," she said.

It's the kind of information that investigators are seeking as they continue to work on the case with the final police report, not due out until June.

The Parkers said their nearly hourlong meeting with Peter Lanza was very emotional.

Robbie Parker said he got the impression that Lanza "was very grateful for the opportunity to get the chance to speak to somebody."

Emilie's father said from the first moments after the killings the couple came "to a degree, a kind of peace with some of it, because we knew that we couldn't undo any of it. So the idea of wasting any energy on anger towards somebody or trying to point blame at anybody seems like a waste of time and energy that we can use to be better parents to our girls."

Emilie, 6, was their oldest child. They have two younger daughers, Madeline, 5, and Samantha, 3.

State legislators are continuing to work on a gun control bill and are getting closer to agreement on the measure, possibly to be ready by next week.